He struggled to impose himself on the Scottish game in his first year at the club, prompting Celtic to let him leave on loan.

Former Denmark star Sivebaek has not heard from any clubs about his client, and is not convinced there is an obvious route way out of Celtic, where Gravesen has 12 months of a lucrative three-year contract remaining.

"I don't know, I've got no idea to be honest," said Sivebaek. "I've not heard anything about Wolves."